NASA X-ray spacecraft discovers supernova wreckage at the heart of the Milky Way
NASA's Chandra X-ray spacecraft has detected the supernova wreckage of a dead star that erupted 1,700 years ago and ejected debris at 2 million miles per hour.
21st TSC Soldier Promoted to Master Sergeant During Ceremony at Panzer Kaserne
德国凯撒斯劳滕 — 美国陆军军士长。 Nikole Jurecko，第 21 战区保障司令部 G-6 作战士官...
